Letter sealer



FIG. 1 is a front view of the letter sealer showing our new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side front top perspective view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a top plan view thereof.

The broken line showing of environment in the drawing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a letter sealer, as shown and described. 